<!DOCTYPE HTML> <html class="reftest-wait"> <head> <style type="text/css"> #rear { width: 500px; height: 1500px; box-shadow: 0 0 71px #667; display: block; } </style> <script> document.documentElement.scrollTop = 0; function doTest() { document.documentElement.scrollTop = 108; document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate", doTest); </script> </head> <body> <div id="rear"></div> </body> </html>